Fig. 5
From: Characterising the performance of a drone-mounted real-time methane imaging system
Simplified schematic for surface investigation accompanied by example images taken by the device for (a) steel at a distance of 3.1m, (b) aluminium at a distance of 5m, (c) \(18\%\) reflective photography calibration card at a distance of 7.1m, and (d) tarmac at a distance of 9m. Note that a gain of 0.7 was applied to the visible channel to enhance clarity of the gas signal in these frames.
